ClinVar Miner

Submissions for variant NM_178012.5(TUBB2B):c.1139G>T (p.Arg380Leu)

dbSNP: rs587784498
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Genetic Services Laboratory, University of Chicago RCV000147833 SCV000195307 likely pathogenic Complex cortical dysplasia with other brain malformations 7 2013-02-08 criteria provided, single submitter clinical testing
Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard RCV000147833 SCV005045253 likely pathogenic Complex cortical dysplasia with other brain malformations 7 2024-05-22 criteria provided, single submitter curation The heterozygous p.Arg380Leu variant in TUBB2B was identified by our study in one individual with cortical dysplasia, complex, with other brain malformations 7. Trio exome analysis showed this variant to be de novo. The variant has also been reported de novo in one individual with polymicrogyria with other brain anomalies (PMID: 23495813) with confirmed paternity and maternity. It was absent from large population studies. This variant has been reported in ClinVar (Variation ID: 160177) and has been interpreted as likely pathogenic by University of Chicago Genetic Services Laboratory. Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. The number of missense variants reported in TUBB2B in the general population is lower than expected, suggesting there is little benign variation in this gene and slightly increasing the possibility that a missense variant in this gene may not be tolerated. One additional pathogenic variant, resulting in a different amino acid change at the same position (Arg380Cys) has been reported in association with disease in the literature, supporting that a change at this position may not be tolerated (Variation ID: 1214258). In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic for autosomal dominant cortical dysplasia, complex, with other brain malformations 7. ACMG/AMP Criteria applied: PS2_Moderate, PM2_Supporting, PP3_Moderate, PP2, PM5 (Richards 2015).

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